Victor Appleton Books in Order

Tom's new gravity-defying skyboard falls into the hands of Xavier Mace, known as the Black Dragon. The criminal scientist intends to weaponize the invention, forcing Tom to outwit an enemy whose technology makes confronting him especially difficult.

Tom's latest invention reverses evolution instead of delivering its intended breakthrough. With living creatures threatened by transformation into prehistoric forms, he must contain the experiment before a scientific mistake changes the world into a dangerous new Stone Age.

A miniature black-hole experiment sends Tom into a parallel universe, exchanging him with a criminal double. Hunted by authorities there, he must find a way home before his counterpart uses Swift Enterprises to pursue wealth and power.

Tom's latest invention and Sandra's protective firefighting suit are stolen by someone calling himself Captain Invisible. The thief begins acting as a superhero, unaware of a potentially fatal flaw that makes recovering the devices an urgent rescue mission.

An untested program sends Tom's Total Reality Generator into the world of the role-playing game Galaxy Masters. What should be a simulation becomes a dangerous confrontation with imagined enemies, leaving him searching for a way back to reality.

Tom's powerful new telescope detects a granite cube orbiting Earth with a message in an unknown language. The discovery raises questions about its origin, drawing the young inventor into a mystery much closer to home than expected.

Tom is experimenting with fish growth to help feed hungry people when monstrous sea creatures appear near Laguna Pequeña. Suspecting another scientist's genetic experiments, he investigates a danger that may soon extend from marine life to humans.

Tom's molecular compressor is designed to shrink robots, but an accident reduces him and his friends to miniature size. Insects become deadly predators, and the group must reverse the process before their tiny condition becomes permanent.

A small earthquake interrupts Tom's work on a device that translates brain waves. A terrorist group's threat involving stolen nuclear material makes the next predicted quake far more dangerous, forcing him to confront a looming catastrophe.

Tom develops an invisible force field that can protect vehicles and individual users from attack. A criminal genius wants the invention for worldwide crime, forcing its creator to confront how a defensive breakthrough could become a dangerous advantage.

Tom joins Bud and Yo aboard a research ship while his father tests a submarine for monitoring undersea earthquakes. An unexpected storm cuts off contact with the craft, leaving Tom responsible for finding and rescuing his father.

Tom prepares SwiftBot for a national competition where teenage inventors pit their robots against one another in athletic events. An antiscience terrorist group threatens the gathering, and suspicious interference turns the contest into a dangerous challenge.

Tom and Sandy visit APOGEE, the first hotel in space, as guests at its opening. Amid weightlessness and robotic service, Tom notices troubling incidents, then suspects foul play when a billionaire staying aboard the station disappears.

Tom and Bud travel to Mount Everest to test a robot Sherpa and new snowboarding equipment. A possible sighting of the Yeti draws Tom's attention, while determined hunters threaten the mountain's environment and whatever mysterious creatures inhabit it.

Tom enters his rocket-powered Swift-Racer in a competition with help from Yo and Bud. Crashes during practice suggest sabotage rather than faulty engineering, leaving him to uncover the cause before another pilot's test flight turns deadly.

While testing Tom's invisibility suit, his father is kidnapped from a park. Despite FBI instructions to stay away, Tom and Sandy investigate, but signs of an inside operation make it difficult to know whom they can trust.

Challenged to tackle industrial pollution, Tom develops technology to repair the ozone layer and help an African nation facing dehydration. Mysterious fighter planes and a hostile neighboring dictator threaten two projects whose success could protect vulnerable lives.

Swift Enterprises is asked to help airlines reduce engine noise and fuel consumption. Existing technology offers few answers, forcing Tom to invent a new turbine while opponents try to sabotage his work and prevent the project from succeeding.

Tom takes on an unfinished Florida weather station project and begins developing a way to break up hurricanes. An explosion, a mysterious submarine and an old enemy turn environmental research into a struggle against sabotage and threats to his life.

When a nuclear submarine disappears during sea trials, Tom devises a rescue and recovery system. The Navy then asks him to locate other lost submarines and their dangerous equipment, but a mysterious black submarine threatens his efforts.

Tasked with creating a coast-to-coast freight train service in just one year, Tom must overcome difficult terrain and uncooperative contractors. Sabotage threatens the project and Swift Enterprises, turning an ambitious transportation scheme into a struggle to protect his family.

A breakthrough in interpreting his Space Friends' messages reveals that their masters intend to recall them. Tom races to build a vehicle and environment that will permit a visit to Earth, while scientific difficulties become an increasingly delicate diplomatic problem.

Tom and Bud investigate a distant anomaly that resembles a black hole but behaves unexpectedly. Their journey through a wormhole brings them face to face with mysterious apparitions, leaving the inventors to confront dangers their instruments cannot explain.

When Pluto disappears and unmanned probes fail, Tom prepares a new spacecraft to investigate. The mystery becomes urgent when a larger object appears on a path toward Earth, forcing him to find a way to avert a planetary catastrophe.

After losing a lunar settlement contract under suspicious circumstances, Tom turns to building a self-sustaining colony on Mars. His proposed habitat must withstand the planet's hostile conditions, while opponents threaten to undermine his efforts before the colonists can establish themselves.

A mysterious request draws Tom into rescue work and the development of equipment for locating buried victims. His next challenge is a spreading geological rupture that threatens New England, demanding an invention capable of confronting destruction beneath the Earth's surface.

Suspicious fires and a dangerous accident involving Bud drive Tom to develop a firefighting system that needs no water. A notebook from his great-grandfather offers a lead, while an old enemy threatens both the project and the inventor's life.

The Navy asks Tom to make its stealth ships invisible to the human eye. When criminals steal his experimental car, he must devise a way to detect it without destroying the value of the technology he is developing.

Tom plans a larger space station with artificial gravity, but funding and transporting materials present serious obstacles. He turns to asteroid mining and a space elevator while political opposition threatens his ability to complete and control the new outpost.

Unexplained vibrations disturb Helium City, drawing Tom and Bud back to the undersea mines. Probes raise more questions than they answer, prompting a descent into the liquid-helium cavern where the friends encounter a problem that resists their efforts to help.

A replacement probe near a distant black hole sends Tom images that appear to show the past. Investigating the possibility of manipulating time, he begins experimenting with an invention whose potential becomes painfully personal when tragedy demands a radical response.

Someone close to Tom develops an inoperable brain tumor, forcing the exhausted inventor to seek an unconventional treatment. His proposed technology meets resistance from Doc Simpson, and saving the patient depends on overcoming both medical doubts and his own limits.

A Hollywood producer commissions Tom to create a safe, wearable flying backpack for a new movie serial. Developing the jetpack becomes more complicated when enemies seek to steal its technology, adding security concerns to government pressure and the studio's demands.

Canada requests a version of Tom's bullet train while Europe seeks faster cargo transport across the Atlantic. Working on both projects, he confronts political interference and dangerous enemies intent on preventing his new transportation systems from becoming reality.

Tom travels beyond Pluto to investigate Eris as another object threatens to strike it. A collision could send debris toward other planets, leaving him and his crew to attempt an unprecedented engineering task: holding together and reconstructing a shattered world.

An overnight school visit to Swift Enterprises turns into a quarantine lockdown, leaving Tom and his friends isolated inside the facility. Unable to contact the outside world, they improvise ways to move between rooms and investigate the suspicious emergency.

Tom and his friends suspect their academy's custodian may be a notorious hacker. Using a new drone to investigate brings threatening messages, and a virus attacking school servers puts neighboring Swift Enterprises systems at risk as they hunt for evidence.

While preparing for a robot tournament, Tom encounters an app that lets students warn each other about surprise quizzes. When someone alters it to enable outright cheating, he and his friends must identify the culprit before mounting punishments overwhelm the school.

Tom revisits an early aircraft design, hoping to turn it into a commercially viable hypersonic passenger plane. His father's funding depends on that goal, but foreign opponents who suspect a military purpose threaten both the project and Tom's life.

Strange dolls appearing around Swift Academy initially seem like a practical joke, until they begin recording and broadcasting private conversations. As increasingly sophisticated spybots expose students' secrets, Tom and his friends search for whoever is directing the invasion.

At a summer science camp, Tom and his friends prepare to test their inventions and Noah's virtual reality simulation. Harmless pranks escalate into vandalism, and evidence implicating Sam sends the group searching for the person threatening his reputation and their projects.

A reality show filming Swift Academy’s Invention Olympics turns friendly competition into conflict. Tom suspects the producers are deliberately stirring up drama, then discovers the cameras may conceal a more dangerous scheme that threatens both his friends and their inventions.

Hidden-camera prank videos unsettle Swift Academy as students fear becoming the next target. Sam studies the footage to expose its anonymous host, only to discover someone is framing her, sending Tom and his friends after the increasingly dangerous prankster.

Tom tests his new submarine while helping friends clean Lake Carlopa during spring break. A scuba-diving team’s suspicious behavior interrupts their service project, raising questions about whether the visitors are using the event to conceal a dangerous undertaking.